为什么告诉我未初始化的内存L呢

Question

#include<stdio.h>
#include <iostream>
#define MaxSize 10

typedef struct {
	int data[MaxSize];
	int length;
}SqList;

void InitList(SqList L) {
	for (int i = 0; i < MaxSize; i++)
		L.data[i] = 0;
	L.length = 0;
}

int main()
{
	SqList L;
	InitList(L);
	for (int i = 0; i < MaxSize; i++) {
		printf("data[%d]=%d\n",i, L.data[i]);
	}
}

Answer 1

函数InitList的参数L传值了，应该传引用。如下

#include<stdio.h>
#include <iostream>
#define MaxSize 10
typedef struct {
	int data[MaxSize];
	int length;
}SqList;
void InitList(SqList &L) {
	for (int i = 0; i < MaxSize; i++)
		L.data[i] = 0;
	L.length = 0;
}
int main()
{
	SqList L;
	InitList(L);
	for (int i = 0; i < MaxSize; i++) {
		printf("data[%d]=%d\n",i, L.data[i]);
	}
}

// Output
data[0]=0                                                                                                                                                                            
data[1]=0                                                                                                                                                                            
data[2]=0                                                                                                                                                                            
data[3]=0                                                                                                                                                                            
data[4]=0                                                                                                                                                                            
data[5]=0                                                                                                                                                                            
data[6]=0                                                                                                                                                                            
data[7]=0                                                                                                                                                                            
data[8]=0                                                                                                                                                                            
data[9]=0